US4989409A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Exhaust device for small sized boat engine
Assignee: Yamaha Marine Co Ltd
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Filing: 1989-09-22
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Granted: 1991-02-05
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Expires: 2009-09-22
Abstract
Abstract A small watercraft embodying an improved exhaust system that is substantially completely watercooled by a cooling jacket. The exhaust system includes an elastic joint that is also completely surrounded by the cooling jacket so as to insure adequate cooling under all running conditions. A damming arrangement is incorporated so as to insure that all of the exhaust portions being cooled will be completely encircled with cooling water even when low amounts of water are being circulated and a drain system is also provided so as to insure that the cooling jackets will be drained when the watercraft is removed from a body of water.
Inventors
- 👤 Ryoichi Nakase
- 👤 Shigeharu Mineo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:43
CPC Classifications
F; F01; F01N; F01N13/00; F01N13/12; B; B63; B63B; B63B34/00; B63B34/10; F01N13/004; F01N3/00; F01N3/02; F01N3/04; F01N3/043; F02; F02B; F02B61/00; F02B61/04; F02B61/045; F01N2590/00; F01N2590/02; F01N2590/022; F02F; F02F7/00; F02F7/006; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/12
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
119 words
An exhaust system for an internal combustion engine comprising a first inner pipe having an outlet end, a second inner pipe have an inlet end and spaced from the outlet end of said first inner pipe, a first outer pipe encircling at least in part said first inner pipe, a second outer pipe encircling at least in part said second inner pipe, said outer pipes having spaced apart ends, an inner elastic joint interconnecting the outlet and inlet ends of said inner pipes for exhaust gas flow therebetween, an outer elastic joint connecting the ends of said outer pipes to define a cooling jacket around said inner elastic joint, and means for admitting cooling water to said cooling jacket.
Claim 2
Dependent Claim
119 words
An exhaust system for an internal combustion engine comprising a first inner pipe having an outlet end, a second inner pipe have an inlet end and spaced from the outlet end of said first inner pipe, a first outer pipe encircling at least in part said first inner pipe, a second outer pipe encircling at least in part said second inner pipe, said outer pipes having spaced apart ends, an inner elastic joint interconnecting the outlet and inlet ends of said inner pipes for exhaust gas flow therebetween, an outer elastic joint connecting the ends of said outer pipes to define a cooling jacket around said inner elastic joint, and means for admitting cooling water to said cooling jacket.
Claim 3
Dependent Claim
37 words
An exhaust system for an internal combustion engine as set forth in claim 1 further including an exhaust manifold communicating with the first inner pipe at an outlet end thereof and receiving exhaust gases from the engine.
Claim 4
Dependent Claim
22 words
An exhaust system for an internal combustion engine as set forth in claim 2 further including a cooling jacket encircling said manifold.
Claim 5
Dependent Claim
32 words
An exhaust system for an internal combustion engine as set forth in claim 3 wherein the cooling water is delivered to the manifold cooling jacket from a cooling jacket of the engine.
Claim 6
Dependent Claim
29 words
An exhaust system for an internal combustion engine as set forth in claim 3 further including an expansion chamber formed at least in part by the second inner pipe.
Claim 7
Dependent Claim
26 words
An exhaust system for an internal combustion engine as set forth in claim 1 wherein the outer elastic joint is longer than the inner elastic joint.
Claim 8
Dependent Claim
26 words
An exhaust system for an internal combustion engine as set forth in claim 3 wherein the outer elastic joint is longer than the inner elastic joint.
Claim 9
Dependent Claim
26 words
An exhaust system for an internal combustion engine as set forth in claim 5 wherein the outer elastic joint is longer than the inner elastic joint.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-02-04 | 1994-08-06 | 1995-02-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-02-04 | 1998-08-06 | 1999-02-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-02-04 | 2002-08-06 | 2003-02-05 | $7700.00 | Window Closed / Lapsed |